At 14.05 hours on 17 Mar, 1943, U-384 (Rosenberg-Gruszcynski) fired three torpedoes at the convoy HX-229 northeast of St.Johns, heard three detonations and claimed two ships sunk and another as damaged. At the same time U-631 reported the sinking of a tanker with one torpedo. It is unlikely that the Coracero in station #92 and the Terkoelei were hit by the same U-boat, apparently U-384 sank the first ship and U-631 the latter.

The Terkoelei had been in station #104, but in the morning on 17 March took over the station #91 as leading ship of the starboard column. At 14.06 hours, U-631 attacked the convoy, heard after 1 minute 18 seconds a hit and then sinking noises. The crew, consisting of Dutch men, Lascars and British gunners, abandoned ship in four lifeboats but many Lascars were so shocked that two boats failed to clear the capsizing ship and were hit by the mainmast and the funnel, drowning many occupants. The survivors were picked up by HMS Mansfield (G 76) (LtCdr L.C. Hill, OBE) and landed at Gourock.